The ABB REF620E_F NBFNAAAANDA1BNN1X, a dedicated feeder protection relay in the Relion® series, integrates multiple functions including protection, control, measurement, and monitoring. Specifically designed for feeder protection in medium-voltage substations, it flexibly handles radial, ring, and mesh distribution networks, and can operate stably even when connected to distributed generation equipment. Here are its key details: Basic Configuration and Compatibility: This relay uses a wide rated power supply of 100-240V AC/DC, adapting to industrial power distribution scenarios in different regions. It operates at a frequency compatible with 50/60Hz and can operate stably in a temperature range of -20℃ to 60℃. With an IP40 protection rating, it can withstand common industrial dust intrusion. It features a pluggable, removable unit design, measuring approximately 210mm × 140mm × 124mm and weighing about 1.5 kg. It is convenient for both panel and rack mounting, allowing for quick disassembly and testing during maintenance, significantly reducing downtime. The equipment is equipped with a large LCD graphic display screen that can show customized single-line diagrams. It supports both local direct operation and settings, as well as remote control via a web browser-style human-machine interface, offering a highly user-friendly interface.

Core Protection Functions: Its protection functions cover the core needs of feeder operation across all scenarios. Basic protection includes overcurrent, overvoltage, undervoltage, and short circuit protection, enabling rapid response to line anomalies and triggering protection actions. Its ground fault protection is particularly noteworthy, employing a unique multi-frequency admittance protection design. Compared to traditional devices, this significantly improves the sensitivity and selectivity of fault detection, accurately addressing potential ground fault hazards. It also supports various optional function packages for expansion, such as a rapid short-circuit and ground fault location package to help maintenance personnel quickly pinpoint fault locations; a distributed generation interconnection protection package to adapt to distribution networks containing distributed power sources such as wind power and photovoltaics; and optional capacitor bank protection and basic motor protection functions to meet diverse expansion needs. Furthermore, it also features auxiliary protection functions such as phase step and circuit breaker fault protection, forming a comprehensive feeder protection system.

Communication and Interconnectivity: Excellent communication compatibility, natively supporting IEC 61850 Version 1 and 2 protocols, including HSR and PRP redundancy mechanisms. Combined with GOOSE messages and IEC 61850-9-2 LE functionality, it reduces field cabling and enables monitorable communication status, preventing control failures due to communication interruptions. It is also compatible with mainstream industrial communication protocols such as Modbus, DNP3, and IEC 60870-5-103, allowing seamless integration into power distribution control systems from different manufacturers. For time synchronization, it supports the IEEE 1588 V2 precision time protocol, enabling high-precision time calibration between multiple devices, ensuring time consistency of fault records, data monitoring, and other information, providing reliable evidence for fault tracing.

Typical application scenarios: In power plants and medium-voltage substations, it is the core protection equipment for incoming and outgoing feeders, preventing faults from spreading and affecting the safety of main equipment; in process industries such as petrochemicals and mining, it can protect the distribution feeders within the plant area, preventing production equipment shutdowns due to line faults; for industrial park distribution networks connected to distributed photovoltaic and wind power, by selecting interconnection protection function packages, it can coordinate the operation of distributed power sources and the main grid, ensuring power supply stability; in addition, it can also be used in water treatment, building power systems, and other scenarios, providing customized protection and control solutions for various distribution feeders, improving the reliability of the overall power supply system.

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